Automatic telephone system using single motion switch by-path circuits



W 1933- J. H. E. BAKER 1,905,785

AUTOMATIC TELEPHONE SYSTEM USING SINGLE MOTION SWITCH BY-PATH CIRCUITS Filed June 26, 1930 2 Sheets-Sheet 1 FIG. l-A

ill 3 Q1 T v k4 k6 ihs ka] 4 4 4 IN! 1N2 m it? k9 l INVENTOR JOHN H. BAKER ATTORN EY April 25, 1933. J. H. E. BAKER AUTOMATIC TELEPHONE SYSTEM USING SINGLE MOTION SWITCH BY-PATH CIRCUITS Filed June 26, 1950 2 Sheets-Sheet 2 INVENTOR JOHN H. E. BAKE ATTORNEY Patented Apr. 25, 1933 UNI ED- STATES Parser OFFICE.

JOHN HENRY ELVIDGE BAKER, 0F" .AEDWYCH, LONDON, ENGLAND, ASSIGNOB- TO INTER- i NATIONAL STANDARD ELECTRIC CORPORATION, OF NEW YORK, N. Y.

AUTOMATIC TELEPHONE USING: SINGLE MOTION SVVITCFH BY-IEATH CIRCUITS Application filed lune 26, I930,.Seria1'No.

This invention relates toautomatic or semi-automatic telephone systems I and is more particularly concerned with systems using single-motion switches wholly or in part for setting up a connection.

In such systems it has been proposed to use selective stages comprising one or more additional switches individual to each con versational switch. or common to algroup of such switches for use in setting up a connection.

.Such systems are of two main types which may be called the auxiliary. control and bypath systems respectively: by auxiliary control is meant a system in which the impulses for setting a selecting stage are received by a switch other than the conversational switch, the latter hunting, for a contact marked by the former: in this arrangement further progress in. the. connection takes place entirely over the conversational switches.

In the by-path systems, a switch other than the conversational switch hunts for and teststhe wanted outlet or outlets: the connection is temporarily extended over said switch, and. is later .transterred-to the conversat onal switch.

' In both. these systems, the switch over which the connection is immediately extended may have to hunt over the greater portion oi the whole of its'contact bank, the time taken being toolarge a proportion of the interdigita-l space for safety. Theobject of the present invention is to provide modifications in or combinations of'the: above systems whereby the time taken in switching through a connection in: response to higher digit values, either over the conversational switch or another switch is greatly reduced.

Three arrangements will be described generally and one of these will be further described inz-detail, .but it is to be understood that the invention is not limited'to' these arrangements but is capable of any modification" within the scope of the appended claims.

According to one method by which the desired object may be obtained, digits up to five in value forinstance are received entirely by a control switch, the conversational 463,920, and in Great Britain July 3, 1929- switch setting up the connection: any impulses beyond the number given above are received by the conversational switch and an part ofthe control switch, the conversational switch then moving on to the required position in its own time.

According to another method two switches other than the conversational switch may be used in a manner similar to that described, in the first method, a non-homingconversational switch being marked from the switch used.

One of the features of the invention consists in a switching stage comprising a plurality of switches including a conversational switch in which one of the switches finds the group of outlets indicated by a digit ata position nearer the homeposition thanlthe position ultimately taken up by the conversational switch in setting up the connection.

parent from the descriptionand will beset" out in the appended statement of claim.

The first method described above will be more particularly described with reference to the accompanying drawings in whichFigs. 1A and 1B which should be arranged with Fig. 1A to the leftof Fig. 1B show a group selecting stage comprising a conversational switch and a control or by-path circuit common to a number of such switches. A similar arrangement could, of course, be used at a final selector stage. a The levels M, N respectivelyof the conversational and control switches'TR, GR, are

used for marking'purposesg The level M is dividedup into ten groups IX of any desired size, while level N has five markingcontacts 1-5 followed by five groups VI+X corresponding to those in level M.' Corre.

sponding contacts in group'sl:VIXjof lfevels M,. N are connectedtogether; If the digit is five or under, the impulses are received ,on switch CR and the required group in level .M.

is marked from a contact in level N. If the,

the connection is finally switched through.

10 The contact 20 of IR is chosen as a starting point for the reception of impulses as being the farthest point IR can reach with safety to be ready to receive the later impulses. It will be seen'that an outlet is always found in 15 the early part of one of the switches.

When the group selecting stage is seized, relays K and 2 in the individual and common circuits respectively operate in a circuit from battery via both windings of 2 in parallel, normal springs CN1, both windings of K, 1N1, contact z'hl, test conductor T to earth at the preceding stage. Impulse relay 1 then operates from battery over its lower winding ch3, I04, @723, calling loop, 71.64, 706, e714, upper winding of 1 to earth. Release relay 4 operates to earth at contact 11, and relays 2, K lock up over contacts 21, 762, 2711, I01, 41, to earth. I I

Relay 8 operated immediately relay K pulled up from earth via wipers N, M of the auxiliary and conversational switches CR,

IR, respectively 709 and 73. When the next digit is dialled, relay iis inipulsed, andswitch CR is stepped thereby in 35 a circuit via 51, 42, 93, ch65, 11 to earth, the

slow to release relay 3 being energized in parellel therewith.

Relay 8 will deenergiZe, when switch CR and a stepping circuit will be closed for switch IR via its interrupter contacts, 703, 61, 92, 07b7, 81 to earth.. If the digitis 1 or 2 when switch IR reaches the first contact of the respective group I or I1 in its contact bank, relay 8 pulls up to stop the switch IR at its contacts 81 and to enable relay 7 to operate when relay 3 falls back at the termination of the impulses. Relay 7 is twostep, and energized first over its upper winding, via 43, 75, 82, to earth and operates its light contact 72, so that when,'after relay 3 has fallen back at the end of impulsing, and relay 8 has operated relay 7 pulls up and at Y its contacts 73 releases releasing relay 8. If the digit was 3, 4 or 5, switch IR would be stopped on contact 20 by the energization of relay 8 from earth on34. WVhen relay'3 releases at the end of dialling, relay 8 releases and IR again steps on until the first contact of the marked group III, IV, or V is reached. Relay 8 then operates momentarily to energize relay 7 fully. A self stepping circuit is thereby formed for IR via I03, 61, 92 and in p'aral1el,.071,5, 71, 31, to earth, and ch7 81 to earth. Operation ofrelay 7 in either case closes a test circuit from earth via 74, upper winding of relay CH, 64, 708 and the test wiper It of the conversational switch so that when the switch reaches an idle contact in the marked group, relay CH energizes, opening the stepping circuit of IR at 071.5,0h7. Relay CH locks 0729, GM, 41 and energizes relay IH via k7, ch8, 62 to earth. The connection is switched through to the positive and negae w p r L ,-1B atzi ti t .=-B ay 11 are released and the CIITCIIIUOIIQIRYS K, 2 is opened at chl. The switch CR is homed via interrupter contacts ch2, off-normal contacts CN2, 41, to earth.

If the switch IR'should find all the wanted group engaged, relay CH does not pull up and relay 9 will energize to earth over contacts ch10, 73,; 709', wiper'andf last terminal in the group and contacts 33 ch11. Relay 9, opening thecircuit of IR at 92, connecting up busytone BT'at 91,.and opening the impulse stepping circuit of CR at 93. i

If the digit is over five, the operations will closesaself-steppingcircuit for CR at 61,-

prepares a modified cir'cuitfor relay'IH at 62 and a stepping circuit for IR at 63,and

changes over the testing circuit at 64 from wiper It to wiper Ct'of the control'switch. When' 'the wiper N reaches the marked first contact of one of the groups VI,"VII, VIII IX 01' X relay 8 operates momentarily to" energize relay .7 fully and switch 'CR continues hunting for a free contact in a' manner similar to that described before for IR. When the switch finds a free outlet, relay CH operates via wiper CT, locks up via chjl, 41 and switches through the connection to wipers CA, CB'at 6713, 0/54. Relay IH does not operate at this timesince contact 62 is operated and contacts 81 are in their normal position due to relay 8 being released. Dialling to the succeeding switching stagecanta'ke place via wipers CA, CB. I

When'the switch CR reaches the wanted group marked by switch IR a self-stepping circuit is formed for switch IR via interrupter contactslc3, 0h2, 61, 92, M5, 71,31 to earth and subsequently when relay CH operates via contacts 63, ch7, 81 to earthr When the switch IR reaches the contacts selected byCR,relay 8 operates via contactschlO, 7 3, 709 and wipers M, N, to'stop- IR. Relay IH then operates via 707, 0708, 62, 81 to earth to transfer-the connection at M3, M4 from wipers CA, GB to IA,IB. The common control relays and relay K are released, switch CR homes, and relay IH locks up to the-test conductor viaz'h5, ihl.

ings via contacts p2, 22 and conductor TP is connected over contacts 321, 0718, 707, to relay IH. If relay OH is not operated before the next pulse on TP, relay IE will operate and lock up, and the control circuit will be released.

lVhat is claimed is:

1. In or for an automatic or semiautomatic telephone system, selecting. means comprising a plurality of single-motion switches, groups of outlets from said selecting means, multiple connections for certain of said groups to the later portion of the bank of one of said switches and to the earlier portion of the bank of another of said switches, and connections for the remaining groups connected to' the earlier portion of the first-mentioned switch.

2. In or for an automatic or semi-automatic telephone system, selecting means as claimed in claim 1, comprising impulse-responding means, and discriminating means adapted to be set in accordance with the number of impulses received by the impulseresponding means, to select the switch in the early portion of the bank of which the group of outlets corresponding to the number of impulses received is located. v

3. In or for an automatic or semi-automatic telephone system, selecting. means comprising-a plurality of single-motion switches, groups of outlets from said selecting means, multiple connections for certain of said groups to the later portion of the bank of one or" said switches and to the earlier portion of the bank of another or" said switches, and connections for the remaining groups connected to the earlier portion of the first-mentioned switch, impulse responding means, discriminating means adapted to be set in accordance with the number of impulses received by the impulse-responding means, to select the switch in the early portion of the bank of which thegroup of outlets corresponding -to the number of impulses received is located, and further means adapted to be operated if the required group is in the second-mentioned switchrto move the first-mentioned switch to a corresponding position.

4:. In or for an automatic or semi-automatic telephone system, selecting means comprising a single-motion conversation switch, a single-motion auxiliary switch, groups of lines. multipled in sequence. in the banks of the conversation switch, :multiple connections for theslatter-half'of said sequence of I groups in substantially the first T half of the 'bank of the auxiliary: switch, marking contacts. atthe' beginningi'of the bank of the auxiliary switch for the first half of the groups in the conversation. switch, markingcontacts in the banks of the conversation switch for the groups in the firsthalf of the auxiliary switch, impulse-responding means, driving magnets for the switchesv and means for repeating a number ofimpulses received equal in number to the number of 30 groups-in the first half of the conversation switch to the magnet of the auxiliary switch,

and any further impulseslto the converse-- 131011 switch. t g

5. In or for an automatic or semi-automatic telephone system, selecting means comprising a single-motion conversation switch-, a single-motion auxiliary switch, groups of lines multipled. inv sequence in the banks of the conversation switch, multiple connections for the. latter half of said sequence of groups in substantially-the: first half ofthe bank of the auxiliary switch,

marking contacts at the beginning of the bank of the auxiliary switch? for the first half of the: groups in the conversation switch, marking contacts in the banks of the conversation switch for the groups in the first half of the auxiliary switch, impulse-responding means, driving magnets 'for'the switches and means for repeating a number of impulses received equal" in number to the number of groups in the first half. ofthe conversation switch to the magnet of the auxiliary switch, and any further impulses to the conversation switch, and further means for stepping the switch which is not receiving the impulses towards the required group of contacts during thereceptionofthe impulses. v

. 6'.'In or for an automatic or semi-automatic telephone system, selecting means comprising a single-motion conversation switch, a single-motion auxiliary or by-path switch, groups" of lines multipled in sequen'ce inthe banks of the conversation switch, multiple connections for the latter half of said sequence of groupsin substantially the first half of the bank of the aux-- iliary or by-path switch, marking contacts at the beginning of the bank ofthe'auxiliary or by-path'switch for the first half of the groups in'the conversation switch, marking contacts in the banks of the conversation switch for the groups in thefirst half of the .versation switch to'the magnet of the auxiliary or by-path switch, and any further. impulses -tothe conversation switch, and means for: stepping the conversation switch to a predetermined ofi-normal position immediatelyprecedingthe marking contacts while the auxiliary or by-patli switch is receiving impulses. y 7-.xIn or .for an automatic or semi-automatic telephone system, selecting means comrisin a sin le-motionconversation switch a single-motion auxiliary or by-path switch, groups of lines multipled in sequence in the banks of the conversation switch, multiple connections for the latter half of said sequence of groups in substantially the first .half of the bank of the-auxiliary switch, marking contacts at the beginning of the bank of the auxiliary or by-path switch'tor.

the first halfof the groups in the conversation switch, marking contacts in the banks of the conversation switch for the groups in the first half of the auxiliary switch, im-

pulse-responding means, driving magnets for the switches and means for repeating a number of impulses received equal in num'- her to the number of groups: in the first half of the conversation switch to the magnet of the auxiliary switch, and any further 1mpulses to the. conversation switch, means for stepping the marked switch to find a line in the marked group, and means for stepping the conversation switch to the outlet corresponding to aselected outlet in the auxiliary or; by-path switch. a

.8, In or, for an automatic or semi-automatic telephone system, selecting means comprising a single motion conversation switch and two single-motion auxiliary switches, groups of lines multipled in sequence in the magnets for the switches, and means for repeating, a number of impulsesequal in number tothe. number of groups in the first half ofthe bank of-the first auxiliary switch to the magnet of the second auxiliary switch, and any further impulses to the. first auxiliary switch.

I 9. In or for an automatic or semi-automatic telephone system, selecting means comprisinga single motion converation switch, a single-motion auxiliary switch, andanother single-motion auxiliary vswitch, groups of lines multipled in sequence in the banks of one auxiliary switch, multiple connections for the latter half of said sequence of groups insubstantiallythe first half of the bank of the second auxiliary switch, marking contacts at the'beginning of the bank of the second auxiliary switch for the first half of the groupsin the first auxiliary switch, im-

pulse-responding means, driving magnets for the switches, and means for repeating a number of impulses equal in number to the'nuniber of groups in the first half of the bank of the first auxiliary switch to the magnet of the second auxiliary switch, and any further impulses to the first auxiliary switch, and further means for stepping the switch which is not receiving the impulses towards the required group of contacts during the reception of the impulses.

10. In or for an automatic or semi-automatic telephone system, selecting means comprising a single motion conversation switch and two singleanotion auxiliary switches, groups of lines multipled in sequence in the banks of one auxiliary switch, multiple connectionsfor the latter half of said sequence of groups in substantially the first half of the bank of the second auxiliary switch,

marking contacts at the beginning of the bank of the second auxiliary switch for the first half of the 'groups in the first auxiliary switch, impulse-responding' means, driving magnets for the switches, and means for repeating a number of impulses equal in number to the number of groups in the first half of the bank of the first auxiliary switch to themagnet-of the second auxiliary switch, and any further impulses to the first auxiliary switch and means for stepping the first auxiliary switch to a predetermined ofif-normal position immediately preceding the marking contacts while the second auxiliary switch is receiving impulses.

11. In .or for an automatic or semi-automatic telephone system, selecting means comprising a single motion conversation switch,

and two single-motion auxiliary switches, groups of lines multipled in sequence in the banks of one auxiliary switch, multiple connections for the latter half of said sequence of groups in substantially the first half of the bank of the second auxiliary switch, marking contacts at the beginning of the bank of the second auxiliary switch for the first half of the groups in thefirst auxiliary switch, impulse-responding means, driving magnets for the switches, and means for repeating a number of impulses equal in number to the number of groups in the first half of the bank of the first auxiliary switch to the magnet of the second auxiliary'switch, and any further impulses to the first auxiliary switch, means for steppingthe marked switch to find a line in the marked group, means for stepping the first auxiliary or by-path switch, to the outlet corresponding to a selected outlet in the second auxiliary switch, multiple connections for all said groups in the banks of the conversation switch, and means for stepping said conversation switch to the outlet corresponding to the outlet to which the first auxiliary or by-path switch is set.

12. In or for an automatic or semi-automatic telephone system, selecting means comprising a single-motion conversation switch in the banks of which groups of outlets are multipled, an impulse registering and marking switch, an auxiliary switch having two sets of wipers and contact levels, in each of which half the groups of contacts multipled to the conversation switch are connected, Wiper switching means for said auxiliary switch, means whereby said auxiliary switch selects an outlet in a wanted group in accordance with the setting of the register switch, and further means whereby the conversation switch is set to the outlet corresponding to that selected by the auxiliary switch.

13. In or for an automatic or semi-automatic telephone system a switching stage comprising a conversational switch and two auxiliary switches, said switches having groups ofoutlets connecting in multiple certain of said groups to the latter portion of the bank of one of said switches and to the earlier portion of the bank of another of said switches, characterized in this that means is provided whereby in response to a digit of a predetermined value one of said auxiliary switches is adapted to engage a group of outlets indicated thereby at a position nearer the home position than the position subsequently taken up by the other of said auxiliary switches, the position subsequently taken up by the latter being effective to mark a corresponding position in the conversational switch.

14. In an automatic or semi-automatic telephone system a selecting stage comprising a plurality of single motion switches, impulse responding means and discriminating means adapted to set up a conversational connection immediately upon receipt of certain values of a digit and a temporary connection over a by-path switch for other values of the digit.

15. In or for an automatic or semi-automatic telephone system circuit arrangements as claimed in claim 13 characterized in this that there is at the switching stage an auxiliary control or by path circuit comprising an auxiliary switch adapted to be connected in common with a number of conversational switches.

JOHN HENRY ELVIDGE BAKER. 

